Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 79: Focus Session: Spins on Surfaces I (joint session O/MA)

O 79.6: Vortrag

Donnerstag, 4. April 2019, 12:00–12:15, H15

Integrating Yu-Shiba-Rusinov states into a tunnel junction — •Christian R. Ast¹, Haonan Huang¹, Jacob Senkpiel¹, Robert Drost¹, Simon Dambach², Ciprian Padurariu², Björn Kubala², Juan Carlos Cuevas³, Alfredo Levy Yeyati³, Joachim Ankerhold², and Klaus Kern^1,4 — ¹MPI für Festkörperforschung, Stuttgart — ²Institut für komplexe Quantensysteme, Universität Ulm, Ulm — ³Universidad Autónoma de Madrid, Madrid, Spain — ⁴EPFL, Lausanne, Switzerland

Magnetic impurities in a superconductor give rise to subgap features called Yu-Shiba-Rusinov (YSR) states. On or near surfaces, these impurities can be well studied locally by scanning tunneling microscopy (STM). We have observed a non-trivial energy dependence of the YSR state as a function of tip-sample distance, similar to findings that have been reported before. The occurrence of this phenomenon deep in the tunneling regime suggests a non-negligible influence of the tip on the YSR impurity. Therefore, in order to interpret this energy dependence, a more holistic model of the tunnel junction including the YSR state is necessary. To this end, we discuss a model that extends the existing Green’s function description of YSR states and also bridges a gap to related models.